"John McCain is a friend, a mentor, and a true patriot. If anyone can tackle a challenge like this, it's him. Bonnie and I extend our heartfelt prayers to John, Cindy, and the entire McCain family. We also pray for John's doctors as they give him the best care available," Perdue said.

Former President Obama also tweeted about McCain saying he is an American hero.

McCain's family says he is in "good spirits and recovering comfortably at home with his family."